The maximum operating temperature range for the LNK354GN-TL is -40°C to 150°C, with a junction temperature (TJ) of up to 150°C.
To ensure reliable start-up, make sure the input voltage (VIN) is within the specified range (85-265VAC), and the output voltage (VOUT) is set correctly using the feedback resistors (RFB1 and RFB2). Also, ensure the input capacitor (CIN) is properly sized and placed close to the IC.
For optimal performance and thermal management, place the LNK354GN-TL near the input capacitors (CIN) and the output diode (D1). Keep the high-current paths (e.g., VIN to CIN, and D1 to VOUT) short and wide, and avoid routing sensitive signals near the switching node (SW).
Select an output diode (D1) with a reverse recovery time (trr) of less than 50ns, and a voltage rating of at least 400V. The diode's current rating should be greater than the maximum output current (IOUT) of the LNK354GN-TL.
The bootstrap capacitor (CB) provides a high-voltage supply (VCC) to the internal gate driver, allowing the LNK354GN-TL to switch the power MOSFET (Q1) efficiently. Choose a capacitor with a voltage rating of at least 25V and a capacitance value between 10nF and 100nF.
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LNK354GN-TL Overview
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